Passivent has conducted extensive SAP calculations on effective techniques to achieve the Code for Sustainable Homes requirements. 

The calculations have highlighted that its Passive Stack Ventilation can deliver better than the current Level 3 target, while reducing build costs. The strategy also eliminates the risk of potentially suffocating the occupants. 

Passivent ran its figures on a Code Level 4 dwelling comparing ventilation using a high performance MVHR (mechanical ventilation with heat recovery) system against the same home with insulating membranes and its PSV. With an air leakage rate of 5m3/m2/hr - twice as good as the current requirement - the PSV combination delivered the performance criteria, and significant build cost savings. 

“There is a huge initial purchase and lifetime cost difference between PSV and MVHR,” explains Passivent domestic product manager Dennis Bates. “In comparative lifetime costings of ventilation in an individual dwelling over 30 years, covering initial purchase, installation and on-going maintenance, by far the most cost effective option is the PSV, costing under £1000 over the life. By contrast, MVHR can cost around £28,000 at today’s prices.”

For more information telephone 0161 905 5700, email info@passivent.com or visit www.passivent.com